SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9305ec2ec270ebc1382ae7077603463288129da75d3e2fd91b869e816c415603' 
  AND token = 'UjsfXnk/49+BJK2TVye8LzheHq/5VOsxWQ42m+C9gEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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