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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e339fe056225902120abd13e16fef5a29a4b7e681fbc5d12774222bb45785ab' 
  AND token = 'MtImpJGwvNsgee6HBRt7Hg5HjzjTIsfmHRij/dPk9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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