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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdb0d111c6828eadd4f88dc23ecba5ab12900a7f5657460ca849cda7b23b9b4' 
  AND token = 'vh6w+zv6DgzldXrz074Fjr1QaDTd98AQvSGKM65pgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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