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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4160b4cb0b94665fad48603b6b2e71e8742e70f63317c5fa45f06f96ae8ff7' 
  AND token = '8LbLPDUIMd016ZttQ+G850qFNYKl2dqWN4AEeg3you0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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