SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93482ce2daf4bedb4ec90af2f98ad1306f6adf0c7e184d32d659463c77254df' 
  AND token = '6XcnRtcH3VHJCuCmm6M4PXc4tltxbrCZ63ceSK+3jKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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