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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ced6f44222dcc724162cc2457fd4e1295d133e1112bfd22f36eedde6e8445a8' 
  AND token = 'q3xBSP9uF92AzK8gwOt4QblUBye4tYKsjs7uwGtKLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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