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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4e4db5e41936b7b0e7fea6e5cc6e559a43d07f3db4b00fa872edd574e92c1b' 
  AND token = 'ti5OfSi00jH2YFur4kY7Umq+nAP4N9hKe9wg/bhe8Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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