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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f08b8c76617ee57b875bad39305e8a740f58a43e3681fe1a80c8f417ceb5c4' 
  AND token = '+b3kvR+tIvl3T4r1RftzHUyeA+koFO8mxg3l0buMM+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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