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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2986426992e6a3c7bc61360c02ee9b75991e0d0c132c8ba00d6daae490ad0ab1' 
  AND token = '9gd+/qCGezsMZ87JBeRSmTht41D3eCTPmwdIbwsuc6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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