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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a3bc207a093ff7a1ea6e056ce4f293de494f8272474915c371d07136920a4b' 
  AND token = '1X/1ZJTQvuzvoml0ZRprTQq1lfNa6poVIbCSYNOMFgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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