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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc20d50be8099fd6b6998bb9d52a15478b4eea8b58e692cf6b202910f68e052' 
  AND token = '8pkd4AJN6kKU0XxqVtmNu2oAT2eKk5SucXQYltecvpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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