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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2f470ee4433391dad50c70a4ab6eaa4065d51261c1b87d58361c7b84e6c7a3' 
  AND token = '8yXIF+r49xpIUKPbMee/HcvmkB93XLaqfK6vkGG033o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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