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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33abe09bceea69b6fc6a8f8de999a890a29218a881d44aa00d18d88383a7b36' 
  AND token = '7VYIHV/fh9qxVcavuO9g8fmH6AZ5PB8sFj5SwtLT9q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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