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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d30456d981994212e3ff9f3137e39e8667aae75a524bc7cdc10baf8495da37c' 
  AND token = 'Rfr+vrdYIElpXj95qgoMatWBsEIKD39oZN3JsZTJL0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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