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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade272df579bae5b2dd0255e69b82f58ceb1ca58bba9a17c938a765d2dee2643' 
  AND token = 'w806CMdAXgRqU8ASo8gT4gnu5faxZvS+q1rqzp+5tZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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