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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73dbff9bf245ecc9d819c2bc8bb68175714eb34c9894a57682a98d04fa759d4' 
  AND token = '9yr9D2Ij1aFBhzbsR9RvXkQt6JJb7Di8Hn5WR6BRANM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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