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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128e6ed1b29d0377a33b72d92be6c5b4ae5e11e84e4b92c2dac44777f8639943' 
  AND token = '9hfGR59o4Z1id70ST3DWTjmM7SvwXWqgt0Vhqunm76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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