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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6a331e4d90ca211826d92688250c0a957195d84852e5b07b1f212768325e32' 
  AND token = 'kBQmVCHdsBEHP2kzRPSoNPOaQF4MC3ZC28Hwz5iCaOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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