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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec5c9657ea63d8cba3ead78fe4a1b00755584b08598f61e22c74915e7ca35ee' 
  AND token = 'ZL+IH6wKCOpYUdHpbWR4KtJEixUNBC10Ls6nyoVBQ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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