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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9637a4c753c13d5c17f4bb17f7b80046437997e9dd7f4f255e792b14ea13a65e' 
  AND token = 'AZkCyhu3Z6Wt5MXjusoPjBJ4sw/0Hhpa5MwxiVF7+78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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