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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7f1c3cf7e279f8e28094a27df6292c2b62ce70dda736eca9b60258a36055a4' 
  AND token = 'Y//yoenC33C53IzLrxXQu/03RdoZ/j1ifXtHupMlSX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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