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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44224cf08ab14ebdf64d0ddc889fd729ac4f86e5adbe2ce4f2f22f0d337763c1' 
  AND token = 'AsesPTw73NPME1CDU4ESJDx2aC7J4eaMq5AmUbdueZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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