SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e380fd68466345805a276604771f2d331bda045aab2fee2ec714076a990d66c5' 
  AND token = 'uv+8HywihYygRcpTL2MhI1jFO/uSZX+9rKKRZIAJAd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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