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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc91bf305aa148d5468efc8324ff5b98b65790f6bc7eeaa212d71ce0a0fd77d' 
  AND token = 'u7oPJ6EPU8PGVyXldmgvbN4TjcDaiAgOr+NEpXB95Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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