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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17f07c31767bc0667cbf1a830ff3de498cc491cd4cea92067aaf92a26156927' 
  AND token = '9oHFl4N6ABlq435pmnek5wBOWcjOC9dmIc4HDFMgMvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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