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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf960187119e02913efc18aebdd464f4e3d5ed3110bb77769f18f3916856c8b9' 
  AND token = '2HnqDLAk0XhVU9NfsJPYnEcu36Uc2BL+VZaXQ9pjbvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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