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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb01379b7d8d70d9a3c1d21fa62478a05fb4aa8cd44303321726068613cdb7a' 
  AND token = 'y8zAwga4+bNl8shTmZHhla42FJDGWJI8b5swXYwadGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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