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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f4450312c8eba3dcb6bc6d1df287e076d6d3fccf0919831c8ac15611cc960c' 
  AND token = 'J7rLK30oYUL+kDH12K3q8KJlipCOCTAbeMjYg0mxClg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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