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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4147a221dd56ee55c5386f0307a0f5a8a5df476942cb4485f9687546b2112b34' 
  AND token = '3Z92rsFF9gOeYE63QME0Ha93k58FXthvQ5UpkcYt130=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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