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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55569586c4bca6ec9f8b9ae1af718a6c54299e2e3c3ae7be7299f03bfa42bd03' 
  AND token = 'xJap3e0gk1UfS910AG92TqP+MXhjayDXKv8IBoaFqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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