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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9bcae886be8bf0aa1aab11623ad8cf5e61b0ff1d6e86dd35465589c23382b7' 
  AND token = 'Om+ZHDJj9iWpbX5zVGhPPdPQ9n9nbD5ypyMKU6li5TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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