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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c80b0a8c7d36e4053c31c2b19bc27bc7c0bc8f3fc5bb4d4436687fd090a9cf' 
  AND token = 'i4wesUkKIsan1hbOJkP7qUozCyuv3DyVqlXnVgQkoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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