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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3298e2d320145fa5142553bb175795f535f752da6f5fad0f2f990dbda654de28' 
  AND token = '2vAQ8BRFtxKJiHSoN1sfPJgCn12Alz0JDq+nepxWkjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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