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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588f24ee0d4028b60e291760f4adb0f6640c28d492d4ab12b447f5a67c8fa724' 
  AND token = 'nHmSHtBn9eGbGPJ+eS723gZBX1ATC8EL+O5Y8Q/XXnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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