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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fa3371eaccd72134e863121e9b7b9a67443d7d15188e827c72f0e97d8c4cd0' 
  AND token = '2K1GyKkI4pVhwly38ouQLLme9t5MPE/yVKOzEWYwRLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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