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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a403167f03304cd9fd0518a5964ccb595e331ce0a7a40cbd7f3f1ab7c50e6fe9' 
  AND token = 'YFc8zzhzX+4z/4t8ydjWva5Hp4wT1daOZRsRsGue+jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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