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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f94f26f092cc68f88a636ebff8d3701fea21adfa6fab8b04d9502cdae308791' 
  AND token = 'yGtUGoCgew6uUPzOGQUnObPEs0Zt9WUhgmPQJ6sC7XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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