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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ef1803337a67b549113e0c7aad93499865673557229c11f4db9f1ce72e09f4' 
  AND token = '7cLHmO4/VX6gmFODsLwRir8CQEEtcZHYTOAxI40u8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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