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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca0f981bf257d701b7ce8eb416504d2930efd10fb33ca01cf27d750b7248861' 
  AND token = '8bu611+8htTG3Z9DJPWyyfRRZyQfapfVSnr56EjLwSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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