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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38b12dd1c94686833c6c1adad40bf294736bc1e99e9b4c06889e21989bbf4fe' 
  AND token = '6yhWv2M35zqakG3GoV6HmjhRCyTKhuT3KrWbKjEp50k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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