SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb9c82b91119757791483d0b452f9bdea2347db032020a6a7db6c89eb8c9973' 
  AND token = 'jWum/arzWLV4Cvu7TiuY3EeZSQHzvj/VwEK1oL2lAFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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