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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb460f8bdf09ad45d95999d810c3e974b94b2b80a665bb002da78dd5d2d8cc2' 
  AND token = 'zcJjY703NqEGDzsBpd7icKIBW7bL3Su0Dbo0N+HID8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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