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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d5785a324059e5602930e71dcb89bd466c31376c66687d620101e470d210c9' 
  AND token = 'X3eYndaKrqYK1XcAoPDkhkUU8M9npYhwfcWEzCvey7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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