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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be8af085c61e2aeb7027264fba18ef3a90559340f15058066fffb7201d95964' 
  AND token = 'Ecwu7UBhNK2upOqeN5B8W0ouH8DN51bqrArCv2BrcUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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