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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0eaa3dcfe7096abc5470e053735c8848066fb51c75cdb8d6c2df07bdedee69' 
  AND token = 'NaPfpyO8rPvd2QN4bfTucN6fzyqB3d39CUa1BjSTuY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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