SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab7069648a1d5c35f5f8bd62e26fbfc08944469419088eed894f703ce76633c' 
  AND token = 'ZhZIvXjBP4RERtDvid6Iyh/wolqJg/1TWqokrgH6L8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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