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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660071252e7efc9837cb8cd9efac7fc9e4331e5882705c6668e354d6aedd98f7' 
  AND token = 'xZ3EUM8oAb3/9O0gjPx5Ch0CRNOdPnHW0TQYAoBNsuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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