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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ace0b7acc102ec98bb3f3dd625736d256e3617c63bffef958771a2b474566dd' 
  AND token = '7SJa+AK/ZQrMl9K712J5jIh33jT3APzaXDh1wlgywb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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