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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1844766c8b6321a8e1101f4d8f94b8ee90f5cb6d5ba78fee71aa849ea5f563' 
  AND token = '44On2HQ8E5ZfmqL71NlTG8/HTutU9NHZo7M//1UzmFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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