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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7eddad14a7f60322dc59fc7b5c76002835ea5acfb37472411de9a60a1f264bf' 
  AND token = '4cH6FZ9EBcbNaIrnIBMqd5CiOu19rMENc2bYlLF6ruk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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