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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39facdaa9a7447c05a9c68d9d5cfd74c3571390d5b5fc95def58797cd204757a' 
  AND token = 'o80LvZVYjGb0BckxWdaNfSWO5Z9Bs82fUqT7oUG4oqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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