SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dafc61edec1fb3f627035950497f1a8ff4ea9a43a6a6f1e003dcdb075271e8' 
  AND token = 'gHzIt6p9SVLdJ7bAGZM1Khp3q47//kmbwSJFkGG4JZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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