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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34fa5584fee7123a46e93b22f987eb64701632ad1822113a24eb44ccc2ba69' 
  AND token = '8+dk+hjVmgl49SK8RId6tfLEb4zmqoV3ojrZTO9TYQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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