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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f979c6fdfe0cc5b1ea79698e14a81865067814dcf1a6efc73882707df474325' 
  AND token = 'CRnNcN2/KzisHmn+1taELEwP48FS3WHVSM/L/5IjOIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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