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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93cf1d506764d743e98726001c717c4baa47d383e61a6511290832d402f1ce4' 
  AND token = 'tGRmj26kn6+HUJxsnwi6Ie3pH5nWXpMaJdmerM4KBtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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