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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa1ad49053fcfeb307934ebb284bcf235927c03db8b9b88d4dc657f30a48995' 
  AND token = 'xZoOKj7X7iTaK3+b8x1OWV18Hz1xxoFOp9GECsO3OVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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