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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd028148c7f5ac9ea2f92ac679190d2b1f29ce0db4bd699043ad9dea6333c6435' 
  AND token = 'P7LidFjKRQRKoRTDloc6NM6vZL2mPo6/GrsNPSksT8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}