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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548de31aaf39dcdba11a474c9867cf3867102d6905619f164a01755e68614659' 
  AND token = 'JNdys9Xdf2FwAhs99/IMRP9Gj3/E0/UASXKKhcLOc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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