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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad698b3d4bdbfc7367faf5c6ec8924be51c43c8b1a605048825970e43fcdbcb0' 
  AND token = 'jlntIHHPzx6CCPhhgbszilNX0QF6fU4t/Dxm6gFJHdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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