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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f381fbf4ed717c7c878b5491052c049311c0f4a359754019f4e14860799b823d' 
  AND token = 'mhsmqeWI1kwH6RQ4xx+7w75fqCJjOXkMiK2V5Q7A8jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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