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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9cb2c65d588662c169d24c91c22e22d0e5315d1e2bae3638e17ba0c7872ab7' 
  AND token = 'WMHUsFIsDZG7iqi6C0nWSSMNtVXHQcWU7jWegS4HGPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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