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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0069f8608f927c71cc6cff05c22197dfd2868b2ee0887939cd735dbccfcb8adc' 
  AND token = '1ARZ+NdnXS0TWd1F5+bXWN0iW+DEmweenTOzjH/ru1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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