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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fc0afe051c87162c132ecfd91aaffc987fd63ec687a9220dfe96caa6e1410f' 
  AND token = 'PkRSNITFe8wwizWapHXHcf533RsAnl+UOTiQ6DIeJtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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