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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d54f539a6aac327b90a582ef74fa2f4b49116f7114160750234dd1616bce85e' 
  AND token = 'ArZrT6/wfXCa9dT/YxOhML+qs2MuyUmce9SioA9q+n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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