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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb65581ec12797980ec84dd571c6935cbc5277867141ae719f1924255a76a7f' 
  AND token = 'OlQe3rd4h/HO7LtELN1InfI68oyyjdqecPE9blN7PH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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