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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353881b56550d8b429cec0807f37dbfb0c5f3c32e205c3a56578fe9e71a5e6d6' 
  AND token = 'UCpkLl1hymklXcaqGiw3HbLao28WxVCMxMcjWsOnGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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