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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8ed422492a72c62a3865bcb0bc61e59ae3e47c316b5d4e601fdc946211d422' 
  AND token = '3k9EmMwwOwhQ9AwNUn0QDOTPWClzeP8xf9TxwiSattk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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